Keystones — Capstone
Five GCSE retrieval questions · 19 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: x² - 11x + 1
Answer: (x - 11⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 64°. Give your answer to 2 decimal places
Answer: 161.78cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 24:56:49 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 50, 86, 64, 60, 58, 58. Give your answer to 2 decimal places
Answer: Mean = 62.43, Median = 60, Range = 36